This disclosure describes new high temperature, radiation-resistant, ferritic-martensitic steel compositions. The new steels generally contain 9.0-12.0 wt. % Cr, 0.001-1.0 wt. % Mn, 0.001-2.0 wt. % Mo, 0.001-2.5 wt. % W, and 0.1-0.3 wt. % C, with the balance being primarily Fe. More specifically, steels having from 10.0-12.0 wt. % Cr are considered particularly advantageous. Small amounts of N, Nb, V, Ta, Ti, Zr, and B may or may not also be present, depending on the particular embodiment. Impurities may be present in any embodiment, in particular impurities of less than 0.01 wt. % S, less than 0.04 wt. % P, less than 0.04 wt. % Cu, less than 0.05 wt. % Co, and less than 0.03 wt. % As are contemplated. Examples of these steels exhibit improved fracture toughness and reduced thermal creep and swelling.

A fastening device for fastening an element in a keyhole-shaped cutout in a wall includes a retaining element which in the fastened state of the fastening device is designed to rest against a front side of the wall, and to at least partially cover an edge of a narrower opening of the key-shaped section in a wall. The fastening device also includes a support element which in the fastened state of the fastening device is designed to engage through a wider opening of the keyhole-shaped cutout in the wall, and to support the fastening device against a lateral edge of the wider opening during fastening.

A fastener sealing material for application to fasteners is formulated from an acrylate present in a concentration of about 90 to about 97 percent by weight of the sealing material and a nanostructured material present in a concentration of about 3 to about 10 percent by weight of the sealing material. The sealant is applied to the fastener as a liquid and is cured using an ultraviolet or LED light source and without the use of heat.

A shockproof nut kit includes an upper nut and a lower nut, in which an end surface of the upper nut is provided with a boss of elliptic cylinder; on the upper end surface of the elliptic cylinder at a longer planar extension side is provided an unfilled corner; in an end surface of the lower nut is concavely formed a cylindrical groove matching with the boss of elliptic cylinder, and in the assembly state, the boss of elliptic cylinder on the upper nut is in clearance fit with the cylindrical groove in the lower nut. The present invention avoids the slipping and displacement of nuts in the meshing process, and ensures the coaxiality of the upper and lower nuts during installation to the utmost. In terms of both safety and shockproof, the present invention achieves satisfactory results, the installation thereof is convenient and reliable, and the disassembly thereof is simple.

A shockproof nut kit includes an upper nut and a lower nut, in which an end surface of the upper nut is provided with a boss of elliptic cylinder; on the upper end surface of the elliptic cylinder at a longer planar extension side is provided an unfilled corner; in an end surface of the lower nut is concavely formed a cylindrical groove matching with the boss of elliptic cylinder, and in the assembly state, the boss of elliptic cylinder on the upper nut is in clearance fit with the cylindrical groove in the lower nut. The present invention avoids the slipping and displacement of nuts in the meshing process, and ensures the coaxiality of the upper and lower nuts during installation to the utmost. In terms of both safety and shockproof, the present invention achieves satisfactory results, the installation thereof is convenient and reliable, and the disassembly thereof is simple.

A three-piece locking fastener including an interiorly threaded intermediate component open at opposite ends. A first screw having a first exterior thread pattern rotationally inter-engages with the interior threads of the intermediate component when installed through a first selected one of the opposite ends, the first screw having a hollow shaft exhibiting a further plurality of interior threads matching a direction of the first thread pattern. A second screw has a second exterior thread pattern opposite the first pattern and, upon being installed within the other selected one of the opposite ends, rotationally inter-engages the interior threads of the first screw, so that loosening of either of the first and second screws being prevented by their counter-threaded orientation.

A fastener to fasten a member to be fastened includes a shaft portion, a tool working surface, and an external operation restricting portion. The shaft portion is provided with a male thread configured to be rotated about an axis line to work so as to fasten the member to be fastened. The tool working surface is formed to a tool working portion integrated with the shaft portion. A tool to rotate the shaft portion works to the tool working surface. The external operation restricting portion is configured to restrict the rotation of the shaft portion through an operation from outside the fastener. In this fastener, the tool working surface to which the tool works is formed in an approximately cylindrical inner surface shape.

A bolt catcher and extractor for use with a separation nut and an attaching preloaded bolt that secure a payload to a launch vehicle or spacecraft. The bolt catcher extracts the attaching bolt from the separation nut, pulls it clear of the interface between the launch vehicle or spacecraft and the released payload, and captures it within the bolt catcher housing. The released bolt may have kinetic energy due to the strain energy stored by the pre-release bolt preload. The bolt catcher may have a magnetic eddy current damper that controls the bolt velocity during bolt extraction and dissipates the bolt kinetic energy as heat. The bolt may be magnetically non-impact captured within the bolt catcher. Bolt momentum at the end of the bolt extraction is less than 2% of that of bolt catchers of the prior art. Shock to the released payload or deployable equipment is near zero.

A bolt catcher and extractor for use with a separation nut and an attaching preloaded bolt that secure a payload to a launch vehicle or spacecraft. The bolt catcher extracts the attaching bolt from the separation nut, pulls it clear of the interface between the launch vehicle or spacecraft and the released payload, and captures it within the bolt catcher housing. The released bolt may have kinetic energy due to the strain energy stored by the pre-release bolt preload. The bolt catcher may have a magnetic eddy current damper that controls the bolt velocity during bolt extraction and dissipates the bolt kinetic energy as heat. The bolt may be magnetically non-impact captured within the bolt catcher. Bolt momentum at the end of the bolt extraction is less than 2% of that of bolt catchers of the prior art. Shock to the released payload or deployable equipment is near zero.

A system and process for removably, replaceably, and fixedly coupling a member to a structure without the need for adhesives or welding. The member is provided with an insert coupling that makes use of reciprocating catches in the mating region of the insert coupling. The reciprocating catches engage receiving features provided in a hollow end of the structures to couple the structure to the member via the insert coupling. The structure can be uncoupled from the member by disengaging the reciprocating catches of the insert coupling from the receiving features of the hollow end of the structure.